I am coding a C# forms application and I have the following collection for a PropertyGrid control:
public class CustomWebpageJavaScriptFunctionCollection : CollectionBase, ICustomTypeDescriptor
{
public void Add(CustomWebpageJavaScriptFunction obj)
{
this.List.Add(obj);
}
public void Remove(CustomWebpageJavaScriptFunction obj)
{
this.List.Remove(obj);
}
public CustomWebpageJavaScriptFunction this[int index]
{
get
{
return (CustomWebpageJavaScriptFunction)this.List[index];
}
}
public String GetClassName()
{
return TypeDescriptor.GetClassName(this, true);
}
public AttributeCollection GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
}
public String GetComponentName()
{
return TypeDescriptor.GetComponentName(this, true);
}
public TypeConverter GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
}
public EventDescriptor GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
}
public PropertyDescriptor GetDefaultProperty()
{
return TypeDescriptor.GetDefaultProperty(this, true);
}
public object GetEditor(Type editorBaseType)
{
return TypeDescriptor.GetEditor(this, editorBaseType, true);
}
public EventDescriptorCollection GetEvents(Attribute[] attributes)
{
return TypeDescriptor.GetEvents(this, attributes, true);
}
public EventDescriptorCollection GetEvents()
{
return TypeDescriptor.GetEvents(this, true);
}
public object GetPropertyOwner(PropertyDescriptor pd)
{
return this;
}
/// <summary>
/// Called to get the properties of this type. Returns properties with certain
/// attributes. this restriction is not implemented here.
/// </summary>
/// <param name="attributes"></param>
/// <returns></returns>
public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
return GetProperties();
}
/// <summary>
/// Called to get the properties of this type.
/// </summary>
/// <returns></returns>
public PropertyDescriptorCollection GetProperties()
{
// Create a collection object to hold property descriptors
PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);
// Iterate the list of employees
for (int i = 0; i < this.List.Count; i++)
{
// Create a property descriptor for the employee item and add to the property descriptor collection
CustomWebpageJavaScriptFunctionCollectionPropertyDescriptor pd = new CustomWebpageJavaScriptFunctionCollectionPropertyDescriptor(this, i);
pds.Add(pd);
}
// return the property descriptor collection
return pds;
}
}
How is the best way to perform LINQ queries on the above collection?
For example, how can I perform a .Where() action on the contents of the CollectionBase List?